summaryrefslogtreecommitdiff
path: root/thirdparty/openssl/crypto/evp/bio_ok.c
diff options
context:
space:
mode:
Diffstat (limited to 'thirdparty/openssl/crypto/evp/bio_ok.c')
-rw-r--r--thirdparty/openssl/crypto/evp/bio_ok.c624
1 files changed, 0 insertions, 624 deletions
diff --git a/thirdparty/openssl/crypto/evp/bio_ok.c b/thirdparty/openssl/crypto/evp/bio_ok.c
deleted file mode 100644
index 16e151f110..0000000000
--- a/thirdparty/openssl/crypto/evp/bio_ok.c
+++ /dev/null
@@ -1,624 +0,0 @@
-/* crypto/evp/bio_ok.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
- */
-
-/*-
- From: Arne Ansper <arne@cyber.ee>
-
- Why BIO_f_reliable?
-
- I wrote function which took BIO* as argument, read data from it
- and processed it. Then I wanted to store the input file in
- encrypted form. OK I pushed BIO_f_cipher to the BIO stack
- and everything was OK. BUT if user types wrong password
- BIO_f_cipher outputs only garbage and my function crashes. Yes
- I can and I should fix my function, but BIO_f_cipher is
- easy way to add encryption support to many existing applications
- and it's hard to debug and fix them all.
-
- So I wanted another BIO which would catch the incorrect passwords and
- file damages which cause garbage on BIO_f_cipher's output.
-
- The easy way is to push the BIO_f_md and save the checksum at
- the end of the file. However there are several problems with this
- approach:
-
- 1) you must somehow separate checksum from actual data.
- 2) you need lot's of memory when reading the file, because you
- must read to the end of the file and verify the checksum before
- letting the application to read the data.
-
- BIO_f_reliable tries to solve both problems, so that you can
- read and write arbitrary long streams using only fixed amount
- of memory.
-
- BIO_f_reliable splits data stream into blocks. Each block is prefixed
- with it's length and suffixed with it's digest. So you need only
- several Kbytes of memory to buffer single block before verifying
- it's digest.
-
- BIO_f_reliable goes further and adds several important capabilities:
-
- 1) the digest of the block is computed over the whole stream
- -- so nobody can rearrange the blocks or remove or replace them.
-
- 2) to detect invalid passwords right at the start BIO_f_reliable
- adds special prefix to the stream. In order to avoid known plain-text
- attacks this prefix is generated as follows:
-
- *) digest is initialized with random seed instead of
- standardized one.
- *) same seed is written to output
- *) well-known text is then hashed and the output
- of the digest is also written to output.
-
- reader can now read the seed from stream, hash the same string
- and then compare the digest output.
-
- Bad things: BIO_f_reliable knows what's going on in EVP_Digest. I
- initially wrote and tested this code on x86 machine and wrote the
- digests out in machine-dependent order :( There are people using
- this code and I cannot change this easily without making existing
- data files unreadable.
-
-*/
-
-#include <stdio.h>
-#include <errno.h>
-#include <assert.h>
-#include "cryptlib.h"
-#include <openssl/buffer.h>
-#include <openssl/bio.h>
-#include <openssl/evp.h>
-#include <openssl/rand.h>
-
-static int ok_write(BIO *h, const char *buf, int num);
-static int ok_read(BIO *h, char *buf, int size);
-static long ok_ctrl(BIO *h, int cmd, long arg1, void *arg2);
-static int ok_new(BIO *h);
-static int ok_free(BIO *data);
-static long ok_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
-
-static int sig_out(BIO *b);
-static int sig_in(BIO *b);
-static int block_out(BIO *b);
-static int block_in(BIO *b);
-#define OK_BLOCK_SIZE (1024*4)
-#define OK_BLOCK_BLOCK 4
-#define IOBS (OK_BLOCK_SIZE+ OK_BLOCK_BLOCK+ 3*EVP_MAX_MD_SIZE)
-#define WELLKNOWN "The quick brown fox jumped over the lazy dog's back."
-
-typedef struct ok_struct {
- size_t buf_len;
- size_t buf_off;
- size_t buf_len_save;
- size_t buf_off_save;
- int cont; /* <= 0 when finished */
- int finished;
- EVP_MD_CTX md;
- int blockout; /* output block is ready */
- int sigio; /* must process signature */
- unsigned char buf[IOBS];
-} BIO_OK_CTX;
-
-static BIO_METHOD methods_ok = {
- BIO_TYPE_CIPHER, "reliable",
- ok_write,
- ok_read,
- NULL, /* ok_puts, */
- NULL, /* ok_gets, */
- ok_ctrl,
- ok_new,
- ok_free,
- ok_callback_ctrl,
-};
-
-BIO_METHOD *BIO_f_reliable(void)
-{
- return (&methods_ok);
-}
-
-static int ok_new(BIO *bi)
-{
- BIO_OK_CTX *ctx;
-
- ctx = (BIO_OK_CTX *)OPENSSL_malloc(sizeof(BIO_OK_CTX));
- if (ctx == NULL)
- return (0);
-
- ctx->buf_len = 0;
- ctx->buf_off = 0;
- ctx->buf_len_save = 0;
- ctx->buf_off_save = 0;
- ctx->cont = 1;
- ctx->finished = 0;
- ctx->blockout = 0;
- ctx->sigio = 1;
-
- EVP_MD_CTX_init(&ctx->md);
-
- bi->init = 0;
- bi->ptr = (char *)ctx;
- bi->flags = 0;
- return (1);
-}
-
-static int ok_free(BIO *a)
-{
- if (a == NULL)
- return (0);
- EVP_MD_CTX_cleanup(&((BIO_OK_CTX *)a->ptr)->md);
- OPENSSL_cleanse(a->ptr, sizeof(BIO_OK_CTX));
- OPENSSL_free(a->ptr);
- a->ptr = NULL;
- a->init = 0;
- a->flags = 0;
- return (1);
-}
-
-static int ok_read(BIO *b, char *out, int outl)
-{
- int ret = 0, i, n;
- BIO_OK_CTX *ctx;
-
- if (out == NULL)
- return (0);
- ctx = (BIO_OK_CTX *)b->ptr;
-
- if ((ctx == NULL) || (b->next_bio == NULL) || (b->init == 0))
- return (0);
-
- while (outl > 0) {
-
- /* copy clean bytes to output buffer */
- if (ctx->blockout) {
- i = ctx->buf_len - ctx->buf_off;
- if (i > outl)
- i = outl;
- memcpy(out, &(ctx->buf[ctx->buf_off]), i);
- ret += i;
- out += i;
- outl -= i;
- ctx->buf_off += i;
-
- /* all clean bytes are out */
- if (ctx->buf_len == ctx->buf_off) {
- ctx->buf_off = 0;
-
- /*
- * copy start of the next block into proper place
- */
- if (ctx->buf_len_save - ctx->buf_off_save > 0) {
- ctx->buf_len = ctx->buf_len_save - ctx->buf_off_save;
- memmove(ctx->buf, &(ctx->buf[ctx->buf_off_save]),
- ctx->buf_len);
- } else {
- ctx->buf_len = 0;
- }
- ctx->blockout = 0;
- }
- }
-
- /* output buffer full -- cancel */
- if (outl == 0)
- break;
-
- /* no clean bytes in buffer -- fill it */
- n = IOBS - ctx->buf_len;
- i = BIO_read(b->next_bio, &(ctx->buf[ctx->buf_len]), n);
-
- if (i <= 0)
- break; /* nothing new */
-
- ctx->buf_len += i;
-
- /* no signature yet -- check if we got one */
- if (ctx->sigio == 1) {
- if (!sig_in(b)) {
- BIO_clear_retry_flags(b);
- return 0;
- }
- }
-
- /* signature ok -- check if we got block */
- if (ctx->sigio == 0) {
- if (!block_in(b)) {
- BIO_clear_retry_flags(b);
- return 0;
- }
- }
-
- /* invalid block -- cancel */
- if (ctx->cont <= 0)
- break;
-
- }
-
- BIO_clear_retry_flags(b);
- BIO_copy_next_retry(b);
- return (ret);
-}
-
-static int ok_write(BIO *b, const char *in, int inl)
-{
- int ret = 0, n, i;
- BIO_OK_CTX *ctx;
-
- if (inl <= 0)
- return inl;
-
- ctx = (BIO_OK_CTX *)b->ptr;
- ret = inl;
-
- if ((ctx == NULL) || (b->next_bio == NULL) || (b->init == 0))
- return (0);
-
- if (ctx->sigio && !sig_out(b))
- return 0;
-
- do {
- BIO_clear_retry_flags(b);
- n = ctx->buf_len - ctx->buf_off;
- while (ctx->blockout && n > 0) {
- i = BIO_write(b->next_bio, &(ctx->buf[ctx->buf_off]), n);
- if (i <= 0) {
- BIO_copy_next_retry(b);
- if (!BIO_should_retry(b))
- ctx->cont = 0;
- return (i);
- }
- ctx->buf_off += i;
- n -= i;
- }
-
- /* at this point all pending data has been written */
- ctx->blockout = 0;
- if (ctx->buf_len == ctx->buf_off) {
- ctx->buf_len = OK_BLOCK_BLOCK;
- ctx->buf_off = 0;
- }
-
- if ((in == NULL) || (inl <= 0))
- return (0);
-
- n = (inl + ctx->buf_len > OK_BLOCK_SIZE + OK_BLOCK_BLOCK) ?
- (int)(OK_BLOCK_SIZE + OK_BLOCK_BLOCK - ctx->buf_len) : inl;
-
- memcpy((unsigned char *)(&(ctx->buf[ctx->buf_len])),
- (unsigned char *)in, n);
- ctx->buf_len += n;
- inl -= n;
- in += n;
-
- if (ctx->buf_len >= OK_BLOCK_SIZE + OK_BLOCK_BLOCK) {
- if (!block_out(b)) {
- BIO_clear_retry_flags(b);
- return 0;
- }
- }
- } while (inl > 0);
-
- BIO_clear_retry_flags(b);
- BIO_copy_next_retry(b);
- return (ret);
-}
-
-static long ok_ctrl(BIO *b, int cmd, long num, void *ptr)
-{
- BIO_OK_CTX *ctx;
- EVP_MD *md;
- const EVP_MD **ppmd;
- long ret = 1;
- int i;
-
- ctx = b->ptr;
-
- switch (cmd) {
- case BIO_CTRL_RESET:
- ctx->buf_len = 0;
- ctx->buf_off = 0;
- ctx->buf_len_save = 0;
- ctx->buf_off_save = 0;
- ctx->cont = 1;
- ctx->finished = 0;
- ctx->blockout = 0;
- ctx->sigio = 1;
- ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
- break;
- case BIO_CTRL_EOF: /* More to read */
- if (ctx->cont <= 0)
- ret = 1;
- else
- ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
- break;
- case BIO_CTRL_PENDING: /* More to read in buffer */
- case BIO_CTRL_WPENDING: /* More to read in buffer */
- ret = ctx->blockout ? ctx->buf_len - ctx->buf_off : 0;
- if (ret <= 0)
- ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
- break;
- case BIO_CTRL_FLUSH:
- /* do a final write */
- if (ctx->blockout == 0)
- if (!block_out(b))
- return 0;
-
- while (ctx->blockout) {
- i = ok_write(b, NULL, 0);
- if (i < 0) {
- ret = i;
- break;
- }
- }
-
- ctx->finished = 1;
- ctx->buf_off = ctx->buf_len = 0;
- ctx->cont = (int)ret;
-
- /* Finally flush the underlying BIO */
- ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
- break;
- case BIO_C_DO_STATE_MACHINE:
- BIO_clear_retry_flags(b);
- ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
- BIO_copy_next_retry(b);
- break;
- case BIO_CTRL_INFO:
- ret = (long)ctx->cont;
- break;
- case BIO_C_SET_MD:
- md = ptr;
- if (!EVP_DigestInit_ex(&ctx->md, md, NULL))
- return 0;
- b->init = 1;
- break;
- case BIO_C_GET_MD:
- if (b->init) {
- ppmd = ptr;
- *ppmd = ctx->md.digest;
- } else
- ret = 0;
- break;
- default:
- ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
- break;
- }
- return (ret);
-}
-
-static long ok_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
-{
- long ret = 1;
-
- if (b->next_bio == NULL)
- return (0);
- switch (cmd) {
- default:
- ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
- break;
- }
- return (ret);
-}
-
-static void longswap(void *_ptr, size_t len)
-{
- const union {
- long one;
- char little;
- } is_endian = {
- 1
- };
-
- if (is_endian.little) {
- size_t i;
- unsigned char *p = _ptr, c;
-
- for (i = 0; i < len; i += 4) {
- c = p[0], p[0] = p[3], p[3] = c;
- c = p[1], p[1] = p[2], p[2] = c;
- }
- }
-}
-
-static int sig_out(BIO *b)
-{
- BIO_OK_CTX *ctx;
- EVP_MD_CTX *md;
-
- ctx = b->ptr;
- md = &ctx->md;
-
- if (ctx->buf_len + 2 * md->digest->md_size > OK_BLOCK_SIZE)
- return 1;
-
- if (!EVP_DigestInit_ex(md, md->digest, NULL))
- goto berr;
- /*
- * FIXME: there's absolutely no guarantee this makes any sense at all,
- * particularly now EVP_MD_CTX has been restructured.
- */
- if (RAND_bytes(md->md_data, md->digest->md_size) <= 0)
- goto berr;
- memcpy(&(ctx->buf[ctx->buf_len]), md->md_data, md->digest->md_size);
- longswap(&(ctx->buf[ctx->buf_len]), md->digest->md_size);
- ctx->buf_len += md->digest->md_size;
-
- if (!EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)))
- goto berr;
- if (!EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL))
- goto berr;
- ctx->buf_len += md->digest->md_size;
- ctx->blockout = 1;
- ctx->sigio = 0;
- return 1;
- berr:
- BIO_clear_retry_flags(b);
- return 0;
-}
-
-static int sig_in(BIO *b)
-{
- BIO_OK_CTX *ctx;
- EVP_MD_CTX *md;
- unsigned char tmp[EVP_MAX_MD_SIZE];
- int ret = 0;
-
- ctx = b->ptr;
- md = &ctx->md;
-
- if ((int)(ctx->buf_len - ctx->buf_off) < 2 * md->digest->md_size)
- return 1;
-
- if (!EVP_DigestInit_ex(md, md->digest, NULL))
- goto berr;
- memcpy(md->md_data, &(ctx->buf[ctx->buf_off]), md->digest->md_size);
- longswap(md->md_data, md->digest->md_size);
- ctx->buf_off += md->digest->md_size;
-
- if (!EVP_DigestUpdate(md, WELLKNOWN, strlen(WELLKNOWN)))
- goto berr;
- if (!EVP_DigestFinal_ex(md, tmp, NULL))
- goto berr;
- ret = memcmp(&(ctx->buf[ctx->buf_off]), tmp, md->digest->md_size) == 0;
- ctx->buf_off += md->digest->md_size;
- if (ret == 1) {
- ctx->sigio = 0;
- if (ctx->buf_len != ctx->buf_off) {
- memmove(ctx->buf, &(ctx->buf[ctx->buf_off]),
- ctx->buf_len - ctx->buf_off);
- }
- ctx->buf_len -= ctx->buf_off;
- ctx->buf_off = 0;
- } else {
- ctx->cont = 0;
- }
- return 1;
- berr:
- BIO_clear_retry_flags(b);
- return 0;
-}
-
-static int block_out(BIO *b)
-{
- BIO_OK_CTX *ctx;
- EVP_MD_CTX *md;
- unsigned long tl;
-
- ctx = b->ptr;
- md = &ctx->md;
-
- tl = ctx->buf_len - OK_BLOCK_BLOCK;
- ctx->buf[0] = (unsigned char)(tl >> 24);
- ctx->buf[1] = (unsigned char)(tl >> 16);
- ctx->buf[2] = (unsigned char)(tl >> 8);
- ctx->buf[3] = (unsigned char)(tl);
- if (!EVP_DigestUpdate(md,
- (unsigned char *)&(ctx->buf[OK_BLOCK_BLOCK]), tl))
- goto berr;
- if (!EVP_DigestFinal_ex(md, &(ctx->buf[ctx->buf_len]), NULL))
- goto berr;
- ctx->buf_len += md->digest->md_size;
- ctx->blockout = 1;
- return 1;
- berr:
- BIO_clear_retry_flags(b);
- return 0;
-}
-
-static int block_in(BIO *b)
-{
- BIO_OK_CTX *ctx;
- EVP_MD_CTX *md;
- unsigned long tl = 0;
- unsigned char tmp[EVP_MAX_MD_SIZE];
-
- ctx = b->ptr;
- md = &ctx->md;
-
- assert(sizeof(tl) >= OK_BLOCK_BLOCK); /* always true */
- tl = ctx->buf[0];
- tl <<= 8;
- tl |= ctx->buf[1];
- tl <<= 8;
- tl |= ctx->buf[2];
- tl <<= 8;
- tl |= ctx->buf[3];
-
- if (ctx->buf_len < tl + OK_BLOCK_BLOCK + md->digest->md_size)
- return 1;
-
- if (!EVP_DigestUpdate(md,
- (unsigned char *)&(ctx->buf[OK_BLOCK_BLOCK]), tl))
- goto berr;
- if (!EVP_DigestFinal_ex(md, tmp, NULL))
- goto berr;
- if (memcmp(&(ctx->buf[tl + OK_BLOCK_BLOCK]), tmp, md->digest->md_size) ==
- 0) {
- /* there might be parts from next block lurking around ! */
- ctx->buf_off_save = tl + OK_BLOCK_BLOCK + md->digest->md_size;
- ctx->buf_len_save = ctx->buf_len;
- ctx->buf_off = OK_BLOCK_BLOCK;
- ctx->buf_len = tl + OK_BLOCK_BLOCK;
- ctx->blockout = 1;
- } else {
- ctx->cont = 0;
- }
- return 1;
- berr:
- BIO_clear_retry_flags(b);
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-07 03:03:14 +0000